2x(x+3)-7x=18-5(x+4)

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Solution for 2x(x+3)-7x=18-5(x+4) equation:


Simplifying
2x(x + 3) + -7x = 18 + -5(x + 4)

Reorder the terms:
2x(3 + x) + -7x = 18 + -5(x + 4)
(3 * 2x + x * 2x) + -7x = 18 + -5(x + 4)
(6x + 2x2) + -7x = 18 + -5(x + 4)

Reorder the terms:
6x + -7x + 2x2 = 18 + -5(x + 4)

Combine like terms: 6x + -7x = -1x
-1x + 2x2 = 18 + -5(x + 4)

Reorder the terms:
-1x + 2x2 = 18 + -5(4 + x)
-1x + 2x2 = 18 + (4 * -5 + x * -5)
-1x + 2x2 = 18 + (-20 + -5x)

Combine like terms: 18 + -20 = -2
-1x + 2x2 = -2 + -5x

Solving
-1x + 2x2 = -2 + -5x

Solving for variable 'x'.

Reorder the terms:
2 + -1x + 5x + 2x2 = -2 + -5x + 2 + 5x

Combine like terms: -1x + 5x = 4x
2 + 4x + 2x2 = -2 + -5x + 2 + 5x

Reorder the terms:
2 + 4x + 2x2 = -2 + 2 + -5x + 5x

Combine like terms: -2 + 2 = 0
2 + 4x + 2x2 = 0 + -5x + 5x
2 + 4x + 2x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
2 + 4x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(1 + 2x + x2) = 0

Factor a trinomial.
2((1 + x)(1 + x)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Subproblem 2

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Solution

x = {-1, -1}

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